Four 3.2v LEDs & two 1w 56 ohm rest.

Discussion in 'The Projects Forum' started by V Obsession, Nov 22, 2011.

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  1. V Obsession

    Thread Starter New Member

    Nov 22, 2011
    Just singed up & need help, Question: I have four LED's w/ forward voltage 3.2 ,max voltage 3.5V reverse voltage 5V, peak forwd. current 100mA , wattage consumption 0.064 , I want to use in a car so I have 12 V Batt. for power. I think I need two 1w 56 ohm resistors with LED's wired in series. Will this work and where do I put the switch ?(switch is factory 12 V) and will the switch work with this? Any help would be appreciated.
  2. T.Jackson

    New Member

    Nov 22, 2011
    Sounds sane enough and about right. Ohms law maths for a bunch of LEDs isn't that critical. Perhaps add in some over voltage clamping protection in case the alternator fails (overcharging as a result of the regulator failing)
  3. SgtWookie


    Jul 17, 2007
    We no longer support automotive modification topics, LED lighting included, according to the ToS:

  4. Wendy


    Mar 24, 2008
    The All About Circuits forum Administrative Team has elected not to host discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

    This thread is against the AAC forum rules, Chapter 6, as seen here:

    Automotive modifications of any kind are strictly forbidden. Therefore, this thread will be closed.

    Please try to understand the reasons behind this action, and feel free to browse and use the forums.

    You might find answers to your questions in one of these forums:
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